It doesn't seem like using it for automatic 2FA would be practical. For one thing, it wouldn't allow for password managers, and if the environment changes signi

It doesn't seem like using it for automatic 2FA would be practical. For one thing, it wouldn't allow for password managers, and if the environment changes significantly it wouldn't match up (on mobile, using an on-screen or touch keyboard, finger pecking on a laptop while eating at the dinner table, etc.)